Electric controller.



1'. H. HALL.

ELECTRIC CONTROLLER.

APPLICATION FILED APR. 25. 91]. RENEWED )IJLY 10. 1913.

1,197,584. PatentedSept. 5,1916.

21 72v; w my zen of the United States, residing at were *sra'rns PATENT onrron JAY H. HELL, 0F CLEVELAND, (EH10, ASSIGNDR- 0F CLEVELAND, @3 10, A CORPORATION 033 OHIO.

HIANUFACTURING- COMPANY,

TO THE ELEGEEZIC CGNTROLLER Ann nnnc'rnio oonrnotnnn.

Application med April 25,

To all whom may concern v Be it known that I, JAY H- HALL, a citi- Cleveland, in the county of Cuyahoga and State of Ohio, have invented new and useful Improvements in Electric Controllers, the following is a specification.

My invention relates to motor controlling devices, particularly that type in which magnetically operated switches are used to cut out .the starting resistance during the acceleration of themotor.

In controlling devices in which magnetically operated switches are used whose operating windings are energized by current in the motor circuit, it is desirable when the motor is across the line to leave in circuit only the Winding of the last resistance con trolling switch. This cuts down the loss of power'n the motor circuit due tothe resistance of the switch windings and allows amore eilicient design of the switches. It is also desirable to use a series connection of the resistance in the rheostat by which all of the rheostat connections are connected in series with the motor when the motor circuit is first established, and then to cut the resistance out step by step until the motor is across the line. This method is preferable to the multiple connection whereby the resistancesections of the rheostat are succe ssively connected in multiple to increase the current through the motor, since for nearly all sizes of motors the series system of conmotion is more efficient. l.

The object of my invention is to provide a motor controller by which the rheostat sections are connected motor, and that when the last resistance controlling switch closes it will cut out of circuit all of the starting'resistance and also the windings of the other resistance controlling switches,

To further describe my inventionI will refer to the accompanying drawing, which shows a wiring diagram of a vice embodying my invention. In thisdrawing I show a knife switch S for connecting the motor and controller to a source of sup ply. The armature of the motor is represent-ed by A, the shunt field by f, the starting Specification of Letters latent.

1911, Seria1l-lo. 623,212 Renewed July 10, 1913'.' Serial No.

of which in series to start the controlling del Patented 5, ins.

'Z'i'dffid resistance or rheostat sections by R, it. it and the resistance controlling switches S, S S having operating windings CQCZ C, respectively. i

The type of resistance controlling switches shown is the type described in Eastwoods Patent, No. 1,0l0,292, granted October 8, 1912, which has the peculiarity of bei g locked open when the current through the winding is tbove a predetermined value. Upon the lowering of the current in the winding of the switch to this value, the switch will operate and close its contacts.

It will be seen from the drawing that each switch in closing short-circuits a section of the rheostat, and at the same time ener es the winding of the next succeeding sw h, which insures that the switches will close in a predetermined order. Furthermore, the switches remain closed'as long as any current flows through their windings, and therefore do not open their contacts when. any appreciable amount of current is flowing therein; not require any magnetic blow-out devices to protect them from serious arcing.

The operation of the controller is follows: Upon closure of the knife switch S the shunt field f is immediately excited. circuit is also established through the motor armature A, the starting resistance RF, R, the winding C of the switch S, and "the starting resistance R to the negative side or the switch S. This starts the motor with all of the rhcostatic resistance in series with the armature, the amount of current flowing depending upon the value of the resistance. This value of current will be suliicient to lock open the switch S audit will remain open until the motor has speeded up and caused the armature current to diminish to the value at which the switch S is adjusted to operate. At this point the switch 53 will close its contacts, short-circuiting the resistanccsection R and energizing the winding C of the switch S The increase of current in the motdr circuit due to the short-circuiting of the resistance R is suliicient to lock open the switch S", and this switch remains open until the motor has further increased its speed and caused the armature The switch contacts there-fore .1

current to diminish to the point at whichthe switch S will operate, at which time it will close its contacts, whereby the resistance section It. is short-circuited and the winding C of the switch S is energized. The in creased value of the armature current caused by the short-circuiting of the resistance section R will lock open the switch S. It will be noticed that the motor current now flows from the positive line through the armature A, the switch winding C the contacts of the switch S the switch winding G the contacts of the switch S, the winding C, and the resistance section B to the negative line. When the armature current has again diminished owing to the speeding up of the motor to the point at which the switch S will operate, this switch will close 'and shortcircuit the resistance section R by a path which does not include the windings C and CC These windings are immediately deenergized and the switches S and S drop open. The motor is'now connected across the line, having in its circuit only the wind ing C of the switch S, which holds this switch closed so long as any current flows in the armature circuit or until the motor is stopped by the opening of the switch S.

It will be understoodthat the knife switch S can be replaced by any arrangement of main switches including one or more magnetically operated switches, or by a reverser for the motor. It will be also understood that my invention can be applied to other forms of motors, such as series or compoundwound, and that it may be applied to translating devices other than motors.

I claim 1. In a motor controller, a motor, a series of resistance sections, means connecting the motor to a source of supply in series with said sections to start the motor, a

; series of normally open switches for cutting out the resistance sections successively, an operating winding tor closing each switch of the series energized by current.

through the motor, and a shunt including contacts closed by the last switch and short circuiting the windings of the other switches in the said Series, whereby the said other switches are caused to open.

9. In a motor controller, a circuit for the motor, resistance sections for said circuit, magnetically-operatcd switches for shunting said sections successively, the operating windings of said switches being connected in the said circuit, means first connecting said circuit to a source oi. supply including said sections and one oi. said windings, and shunt controlled by tie last switch and slim't-eircuiting the last section of the said resistance and the said windings of the other switches, whereby the said other switches are caused to open.

3. In a circuit to be C(iih'OllQCl, a pluralcuit. therefor, resistance sections for the said circuit, a series of switches adapted to close in a predetermined order for controlling the said resistance sections, windings for the switche energized by current through the motor, means first connecting the said sections all in series in the motor circuit, and means for cutting out the windings of the other switches when the last switch of the series closes, whereby the said other switches are caused to open.

5. In a circuit to be controlled, a series of resistance sections, a series of switches for controlling said sections, arranged. to close in a predetermined order, windings for the switches connected in the said circuit, means first connecting in seriesin the circuit the ries of resistance sections, a series of switches for controlling said sections, windings for the switches energized by the motor current, means connecting the motor to a source of supply in series with said sections and the winding of the first switch of the series, means controlled by each switchin closing to cut out a section of said resistance and energize the winding of the next succeeding switch, and means for cutting out the windings of all the switches in the series except the last and causing all the switches except the last to open 7. In a motor controller, a motor, a series of resistance. sections, means connecting the motor to a source 0" supply in series with said sections to start the motor, a. series of said circuit, means first connecting said cir- 0 cuit to a source of supply including said sections and one of said WlIldlIlgS, and a shunt controlled by the last switch and short-circuiting the last section of the said resistance and the said windings of the other switches whereby the saidcther switches are caused to open,

JAY H. HALL.

Witnesses R. H. BENNETT, H. M. DIEMER. 

